Electric insulator.



A. R. MULLER Patented May 29, 1917.

AUGUSTE ROBERT HELLER, OF WALTHAMSTOW, ENGLAND.

ELECTRIC IN SULATOR.

Specification of Letters Patent.

Patented May 29, 191 7.

Application filed December 4, 1916. Serial No. 135,054.

To all whom it may concern.

Be it known that I, AUGUsTE ROBERT Mi'iLL-ER, a subject of the German Emperor, residing at 56 Shernhall street, Waltham-' stow, in the county of Essex, England, have invented new and useful Improvements in Electric Insulators, of which the following is a specification.

The invention relates to that class of in sulators in which the conductor is secured to the insulator body by means of a screw cap, and its object is to provide an insulator which is inexpensive and simple to construct.

According to the present invention the insulator consists of two parts only, namely, an insulator body having a fiat, annular seating and a groove preferably of angular section extending diametrically across both the body and the seating and adapted to receive a conductor, and a screw cap whose outer uninterrupted depending rim engages with the conductor holding it in the groove. The arrangement is such that all bent portions of the conductor are situated between the points gripped by the cap.

The drawings show insulators made in accordance with this invention.

Figure 1 is a transverse section and Fig. 2 is a section at right angles to Fig. 1 partly in elevation.

Fig. 3 is a transverse section of another form of insulator.

a is an insulator body having a groove 6 convex in the center 0, the base of the groove being of angular section. A flat, annular seating d extends around the insulator body Copies of this patent may-be obtained for five cents each, by addressing the across which the groove 6 is continued. The conductor 6 is firmly held in the groove by a screw cap f. A ring 9 of hard material is molded into the cap f which comes in con tact with the conductor 6 when the cap is screwed home.

In Fig. 3 the insulator body a is molded around the top of a stem it having wings i which prevent any movement of the stem in the insulator.

What I claim is 1. An insulator comprising a body portion, a screw-threaded member projecting therefrom, a flat seating on the body portion, a groove formed in and extending diametrically across said seating and said projection, a centrally located convexity in said groove terminating short of said seating and forming a tortuous path for a conductor, and a screw cap having an annular flange adapted to overlie and cooperate with said seating and engage the conductor only at diametrically opposite sides of the insulator.

2. An insulator comprising a body portion, a screw-threaded member projecting therefrom, a flat seating on the body portion, and an angular groove formed in and extending diametrically across said seating and said projection, a centrally located convexity in said groove terminating short of said seating and forming a tortuous path for a conductor, and a screw cap having an annular flange adapted to overlie and cooperate with said seating and engage the conductor when at diametrically opposite sides of the insulator.

AUGUSTE ROBERT MllLLERI Commissioner of Patents,

Washington, D. G. 

